Machine for molding plastic blocks.



No. 799,799. PATBNTBD MAY 2, 1905.

o. PfTHRocKMoRToN.

MACHINE FOR-MCLDING PLASTIC BLOCKS.

APPLIUATIUN FILED SEPT. 17. 1904.

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` *N y v ATTORNEY 5,

No. 788,739. PAYTENTED MAY 2, 1905.

` C. P. THROCKMORTON. MACHINE FOR MOLDING PLASTIC BLOCKS.

APPLICATION FILED SEPT. 17. 1904.

3 SHEETS-SHEET 2.

W|TNESSES= C INVENTORM,

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C. Stoughton.

PATENTED 'MAY 2, 1905.

C. P. THROCKMORTCN. MACHINE PCR MCLDING PLASTIC BLOCKS.

APPLICATION FILED SEPT. 17. 1904.

3 SHEETS-SHEET 3.

WITNESSES:

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ATTORNEY 5 NITED STATES Patented May 2, 1905.

PATENT OFFICE.

CHARLES P. THROCKMORTON, OF COLUMBUS, OHIO.

SPECIFICATION forming part of Letters Patent No. 788,739, dated May 2,1905.

Application filed September 17, 1904. Serial No. 224,906.

To al?, wil/0m it may concern:

Be it known that I, CHARLES P. THRocK- MORTON, a citizen of the UnitedStates, residing at Columbus, in the county of Franklin and State ofOhio, have invented a certain new and useful Improvement in Machines forMolding Plastic Blocks, of which the following is a specification.

My invention relates'to a new and useful improvement in machines formolding plastic blocks.

The object of the invention is to provide automatic means for releasingthe block when the mold-box is inverted.

A further object lies in the provision of means for continuouslyoperating the machine and also in means for preventing the accidentaldisplacement of the block or portions thereof when the mold-box is beinginverted.

Finally, the object of the invention is to provide a device of thecharacter described that will be strong, durable, eflicient, and simpleto make and one in which the several parts will not be liable to get outof working order.

With the above and other objects in view the invention consists of thenovel details of construction and operation, a preferable embodiment ofwhich is described in the specification and illustrated in the drawings,wherein- Figure 1 is a front elevation of the machine. Fig. 2 is a rearelevation. Fig. 3 is an end elevation. Fig. 1 is a plan View. Fig. 5 isa longitudinal vertical sectional View, and Fig. 6 is an elevationshowing the mold-box inverted and the pallet lowered.

In the drawings the numeral 1 designates suitable standards providedwith wheels or casters 2, by which they are movably supported, whichstandards are connected by means of suitable brace-rods 3, so positionedas not to interfere with the proper working of the machine. Each of thestandards is formed with bearing-boxes 4C, which rotatably support thetrunnions 5 of a mold-box frame 6, provided with a suitable bottom 7,upon which normally rests the bottom 8 of the mold box. The moldbox iscomposed of Wing-plates 9 and end doors 1.0, provided with suitablerollers 11 near their upper ends, which normally contact with the innersurfaces of the frame 6. Rollers 12, projecting from the bottom plate 8upon the outside of the end doors 10, and wing-plates 9 also contactwith the inner surfaces of the said frame 6. The bottom 8 of themold-box is provided with a plurality of openings 13, through whichproject the tapering cores 14, securely mounted upon the bottom 7 of theframe, thus constituting fixed cores and a movable moldbox. The-frame 6is provided with bosses 15, one disposed opposite each of the end doorsand Wing-plates'. Tripping-lugs 16 are formed on the outsides of theside plates and doors in such position as to contact with the bosses 15when the mold-box drops. lt is readily seen that when the frame (i isinverted the mold-box will drop tothe position shown in Fig. G, therollers 11 and 12 acting as guides to prevent wabbling of the box andthe tripping-lugs 16 contacting with the .bosses 15 to open the platesand doors to release the block, which, as is obvious, drops from thetapering cores, which, as before stated, are lixed to the bottom plate 7of the frame.

For the purpose of controlling the moldbox and properly removing' theblock therefrom I provide the cross-head 17, provided with theforwardly-extending arms 18, which are pivoted thereon so that they maybe readily swung over or away from the moldbox and frame. The cross-headis supported upon a vertically-disposed rack-bar 19, operating' inguides 20, mounted on the rear of the frame 6. A boxing 21 projects.from one of the guides and supports a shaft 22, which is supported atits opposite end in a hanger 23, projecting from the corner of the saidmoldbox frame. The shaft 22 has iixed thereon a pinion 24C in engagementwith the rack and a ratchet-wheel 25, engaged by a pawl 26, carrying aweighted end 27. A hand-wheel 28, iixedly mounted on the outer end ofthe shaft 22, provides means for rotating said shaft, whereby thecross-head and arms are raised and lowered. A pallet 29, upon which theblock is deposited, is placed on top of the mold-box after the same hasbeen filled and the arms 18 are brought to bear thereon by manipulationof the hand-wheel 28 and the pinion 24 and rack-bar 19. It is thusapparent that the pallet and the molded block, as well as the mold-box,are securely held in position while the mold-box frame 6 is being'inverted. The inverting of the mold -box frame is performed by means ofa double crank-arm 29, mounted upon the squared end 30 of one of thetrunnions 5. It is to be understood that the crank-arm may be arrangedat either end of the mold-boxand that crank-arms may, if desired, bearranged at both ends. each end with handles 31, in which are arrangedspring-pressed pawls 32, which project beyond the crank-arm and engagein the bifurcated end of the extension 33, `mounted on the standard 1,and the recessed lug 34, also mounted upon said standard. It is readilyapparent that the pawlsfmayengage in either the extension 33 or the lug34, as'clearly shown in Figs. 5 and 6.

The operation of my machine is as follows: The parts being normally inthe positions shown in Fig. 5, except that the arms 18 are swung to eachside, the material from which the block isto be molded is placed in themold-box and tamped down until thefsame is filled. The pallet 29 is thenplaced upon the mold-box and the arms 18 swung thereover. The hand-wheelis now turned and the arms lowered onto the pallet, thus firmly holdingthe same in contact with the top of the moldbox. rIhe pawl 26 engagingin the ratchetwheel 25 prevents movement of the rack-bar during theturning or inverting of the parts.v

The mold-box and frame are now ready to be inverted and the operatorgrasping the handles 31 and pressing the pawls 32 so as to withdraw themfrom engagement with the extension 33 and lug 34 inverts or turns overthe said frame and box. I/Vhen the parts have been completely turnedupside down, the pressure on the pawls is released, which allows them tospring into the recessed lug 34 and bifurcated end of the extension 33.At the same time the weighted end 27 of the pawl 26 forces the said pawlout of engagement with the ratchet-wheel 25, and thus allows the shaft22 to be rotated by means of the hand-wheel 28 and the arms 18,supporting the block'. As the mold-box moves downward the tripping-lugs16 contact with the bosses 15, and thus throw open the end doors andwing-plates, arresting the mold-box and allowing the block to freelycontinue its down` ward course upon the pallet 29. Directly beneath themachine, so as to suitably sup-V port the pallet, I arrange sills 35,having a The crank-arm 29 is provided at considerable length. The palletis lowered until it rests upon these sills, and the moldbox and frameare then returned to their normal positions. It will be understood thatthe movement and operation of the mold-box is entirely automatic, aswhen the frame 6 is swung back to its original position the moldbox willthrough its own weight return to the bottom of the frame, and it willhave already been observed that the downward movement and opening ofthedoors and plates of the box is also entirely automatic. When the partshave been returned to their normal positions, the machine may be bodilymoved upon'its wheels or casters 2 and the block allowed to remain whereit was delivered. The operation of forming other blocks may then berepeated, and it is thus seen that a continuous operation is had.

. I do not wish to limit myself to the exact details of constructionherein set forth, as 'I may make various changes in the same withoutdeparting from the spirit of my invention.

4 Having now fully described my invention, what I claim, and desire tosecure'by Letters Patent, isy 1. In amachine of the type set forth, thecombination with an invertible frame and fixed cores, of a movablemold-box.

2. In a device of the typeset forth, the combination with an invertibleframe and fixed cores, of a movable mold-box, and automatic means foropening said mold-box.

3. In a device of the type set forth, the combination with an invertibleframe and fixed cores, of a movable mold-box, and movable delivery meansacting in conjunction with the said mold-box.

4. In a device'of the type set forth, the combination with an invertiblefratrie, cores fixed on said frame, means for inverting the frame, amovable mold-box mounted in the frame about the cores, movable deliverymeans mounted on the frame, and automatic means for opening the mold-boxwhen the frame is inverted.

5'. In a device of the type set forth, the combination with aninvertible frame, and a movable mold-box, 'of a delivery devicelcomprising vsupporting means,a rack #bar connected to the supportingmeans, and means supported from the frame for raising and lowering therack-bar.

-6.v In a device of the type set forth, the combination with aninvertible mold-box frame, of means for inverting the mold-box framecomprising a crank-arm connected to the said frame, locking meanscarried by the crank-arm, and stops adapted 4to be engaged by thelocking means to hold the parts against movement.

7. In a device of the type set forth, the combination with an invertiblemold-box IIO frame having projections and fixed cores, of guiding meansarranged upon the upper ends a movable mold-box comprising a bottom ofthe sides. plate, guiding means extending from the bot 1 H tom plate,hinged sides mounted upon the CHARMS 1)' HROKMORION bottom plate havingprojections therefrom In presence ofadapted to engage with thetiret-named pro- C. STo'UGHToN, jeotons when the mold-box is moved, andM. B. SCHLEY.

